The most common bigram by far is “more time”, “was very” and “was great” appear indicating people are doing a great job
“grade level” is an interesting response and requires more investigation
AFINN gives a numeric sentiment value for each word, with positive or negative numbers indicating the direction of the sentiment
Chart is weighted by number of occurrences
Per-topic-per-word probabilities topic model with a number of topics proportional to the response types.
“Nothing”, has the highest probability response to what could have improved your experience, which is a really good sign!